Need a gamma emitter (radiology lab experiment equipment)

I need a DIY low cost gamma ejector unlike gamma chambers that comes with reactors. I need to keep REM within 1-20 REM. I need help in building one.

Beceriler: Kimya Mühendisliği, Mühendislik, Makine Mühendisliği, Elektrik Mühendisliği, Malzeme Mühendisliği

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Proje NO: #26096874